Set in 1930s Shanghai, the drama follows Ma Tianming, a cunning conman who becomes entangled in a dangerous political conflict. After a twist of fate makes him a suspect in a case, he assumes the identity of Hengshan Hospital’s chief doctor, Cai Likun—only to discover that Cai is a member of the underground Communist Party. As he struggles to maintain his cover, Ma Tianming finds himself caught between survival and a greater cause.